The four men, including former diplomat Naji al-Nuaimi, had sympathised with more than 60 Islamists detained since March, had called for reforms, or had criticised the security forces on-line, activists said.

2025 GMT:Yemen. President Abdrabuh Mansour Hadi has abolished two major military units, including one commanded by the son of former President Ali Abdullah Saleh.

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"The army was restructured into four units, the land forces, the navy, the air force and the border forces," State television reported, as the Republican Guard and the First Armored Division were abolished.

Brigadier General Ahmed Saleh, the commander of the Republican Guard, had refused orders this to hand over long-range missiles to the Defense Ministry.